Heart Sound 心跳声
(1) connect a bluetooth headset
(2) accept the healthkit authorization on iPhone app
(3) turn on the watch app, and touch the start button
(4) just wait a moment and you will hear the heart beat sound
note:
the heart sound is not very accurate and just for fun.
(1) 连接蓝牙耳机
(2) 手机端授权
(3) 按开始按钮等一会儿就能听到心声了
心跳声并不是特别准，仅供娱乐！